Re: 97 Merc 150 EFI water pressure
After reading and watching some videos on how to replace the impeller, I pulled the lower unit this after. It was pretty simple.
Looking at the impeller it looks fine to me, the blades are curved but I know that's normal after it used. Housing looks great as well. All I know to do at this point is take the impeller to the shop and get a new one and put it all back together and see what happens.
Here's the crux. The impeller was changed this time last year, at least that's what the mechanic said they did (same issue, no water pressure). He said that sometimes when they sit over the winter when you go to crank the engine the first time in the spring/summer it strips the impeller (or something like that). Well, I brought the boat home, immediately hurt my back and it's sat under the carport until recently. Pretty sure I never tested it once we brought it home, it certainly never went into the water since it was in the shop last. So I'm thinking that possibly using the flush port doesn't get enough water to the impeller and it maybe hurt it. I noticed in one video that the mechanic talked about adding some grease to the blade ends when reinstalling to protect the impeller from the owners that go home and crank it in the driveway (he said lack of water).
Anyway, given this is a wear part, seems like might as well replace it anyway, but my understanding is this is the main part of the water pump. The rest being (according to the diagram) looks to be all forged steel or non-mechanical. Is this correct? Short of the lower water pump being cracked is there anything else to it?
Any other thoughts on what might could be wrong if this doesn't fix it?
Thanks
